We are already past that point. Bartering for products and services between businesses or businesses and customers is already considered taxable income by the IRS.
The only reason they haven’t gone after individual bartering is because there is no way to do it. I’m sure they (and the NSA) are working on it though.
With every drop of the statist’s hammer we get closer to the point where the people realize that we are ALREADY in a civil war and have always been.